Polaris Frontier Owner's Manual page 42

THE PERFECT FIT
M10 Suspension
M10 Features
SAG SETTINGS - Describes the difference in height of the rear
bumper from the sleds fully extended position to its loaded height with
the rider seated on the sled.
A good initial starting point is 4" of SAG. Note that this measurement
is at the rear bumper. Too much SAG will result in bottoming and too
little SAG will result in reduced rider comfort.
SAG travel is used to control ride quality and rebound travel and off
the tops of bumps. SAG is controlled by FRA and PRELOAD
settings. For more information, refer to the INITIAL SETUP
REFERENCE CHART found on page 42, or the suspension set up
decal located under the hood of the snowmobile.
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